The PTR will be taken offline today. While this doesn't mean anything official, patches usually follow the Tuesday after the PTR are taken down.

So get ready to wait for 2.3! ;)

Here's the source, from Hortus:

The PTRs will be taken offline today September 20th at 11:00 AM Pacific Time, this will conclude our public testing for 2.2.

We would like to thank everyone who participated in the 2.2 PTR, your patience and assistance has been greatly appreciated.

I hope to see you all again in the next test phase.